Screw pump



April 12, 1927" LQ J; BLACK ET A'- SCREW -PUMP Filed Sent. 16. 1926 2Sheets-Sheet l L. J. BLACK ET AL April 12, 1927.

SCREW PUMP Filed sent. 16. 192e 2 Sheets-Sheet 2 'll/z M u. l

gnou/mfom, Zao

EE. SW

Patented Apr. 12.1927.

uiu'rany STATES PATE-Nr OFFICE.

LER .1. BLACK Nn ERNEST E. sworn, or imminent. l'rnxas;

SCREW PUMP.

Application med s'epteiiiberic, 1926. seriai No. 135,871.

This invention'relates to screw pumps and more particularly to -adeviceof this char- .acter employing opposed screws as a'means fdrgenerating water pressure. y, 0 p An important object of the inventionis to provide a device of this character wherein the screw may bereadily replaced and Wherein the mountings of the screw are readilyacceible for removal or repair.

A further object of the` invention is to provide the chamber in whichthe screw yoperates with a removable liner and a novell A still furtherobject of the invention is to generally .improve the structure of thistype of (pumps, so that they may be more readily an cheaply manufacturedand more readilyrepaired. 4 i

.These and. otherobjects' we attain lby the vconstruction shown in theaccompan ing drawings, wherein for the purpose of i lustration is showna preferred embodiment of our inventionrand wherein Figure 1 is alongitudinal sectional vieW through a pump constructed in accordancewith our invention;

Figure 2 is a central transverse sectional view therethrough. v

Referring -now more particularly to the drawings, the numeral 10generally ydesig-` f -nates a pump barrel having removable heads 11 atopposite ends thereof. Within the barrel, a liner support 12 ismaintained in spaced relation to the walls ofthe barrel andlhas itsendsv spaced from the adjacent Aheads 11. rlhe central portion 13 ofthis liner support has a hexagonal bore, while the ends thereof have acircular bore 14 equal to, the circumscribedA diameter of the hexagonalbore 13. A liner 15 is provided `in the form of a sleeve, the exteriorof which is hexagonal at its central portion 16, and its within the'hexagonal portion 13 of the bore of the liner support. The ends of theliner are exteriorly rounded and oppose the walls of the circular bore.of the liner support in spaced relation thereto to provide a packingspace. 17.

These packing spaces appear at of the liner support by adjusting screws18 threaded through the headsv 11 and held in posit-ion by lock nuts 19.The heads-11 are each provided with a bore 20 co-axial with the bore ofthe liner and through this bore .extends a packing gland 21 having atits inner end a Harige 22 abutting the inner face of the Iassociatedhead through a lead or other suitable gasket, indicated at 23. The outerend of the gland is exteriorl threaded at 24 for the reception of a locnut 25, by means of which the flange of the gland may be drawn tightlyagainst the gasket 23. ",lhese threads likewise serve to provide themounting for aveap 26 by means of which the gland fol1ower'27 is movedinwardly against the packing'2y8. 1

These glands rotatably support the smaller outerends 29 of a shaft30.rl`he shaft has anenlarged central portion 3l and be-l tween thiscentral portion and the outer ends .29 an intermediate portion 32 uponwhich the Worms 33 are mounted. 34 produced upon the shaft between theenlarged central portion 31 and intermediate portions 32 provide limitsregulating the approach of worms 3 3 toward the center of the shaft andthe shaft has threaded portions 35 for mounting lock nuts 36 which serveto maintain the worms against these shoulders. The worms are suitablykeyed to the shaft, as at 37. The liner 15 is provided centrally Theshoulders with an inwardly projectinglange 38 exl tending adjacent thesurface of the enlarged portion 31 of the shaft. This flange is slottedat 39 to provide a passage which is directed outwardly toward anoutlet on# ing 40 which is projected through the liner carrier and the outerwall of the worm, as indicated. The Worms 33 are preferably produceduponl trunco-conical cores 41, the base or larger ends of which abut theshoulders 34 and oppose the flan e38.` These base ends'are of slightly'less iameter than the bore of the liner at the large ends thereof andhave produced thereon a worm thread 42 which comes into close contactwith the inner wall of the bore throughout its length. Since the spacebetween the face of the core and the wall of the bore decreases towardthe center of the linerit will follow that each end of fluid passingybetween the worms will be 11 compressed during its passage andaccordingly under considerable pressure when it reaches the flange 38. lThe face of the worin in its coaction with the flange acts more or lessas a valve alternately cutting off and permitting communication betweenthe fluid space and the opening 39, thus permitting j the pressure tobuild up to a still higher lll point. The inner end of the slot 39 isaligned with the adjacent ends of the cores fil, so that the formationabout the shaft between these cores of a dead water space is eifectuallyprevented. The walls of the opening 39 further serve to break up thetendency of fluid received from the worm to rotate and direct this fluidto the outlet. lt will, of course, be understoodthat fluid entering thebarrel of the pump will till the space within the barrel and enter atthe outer ends of the worms.

pump of this character may be very readily assembled or disassembledwhen any repairs are necessary. 1f, for example, it

is necessary to renew the screws and liners, it ismerely necessary tounbolt the heads ll and remove them from the body ofthe pump. This willrelease the worms 33 and glands 17 and the packing may be pulled fromabout the liners. The entire liner, with its assemblage of the shaft andworms, may then be bodily withdrawn from the pump for repair. To removethe liner from the shaft, it is then merely necessary to remore one ofthe worms 33. Out-bearings 43 may be provided for the projecting ends ofthe shaft and where provided, these willbe carried by the heads 11, sothat they may be removed therewith. j

It will be obvious that the construction hereinbefore set forth iscapable of a certain range of change and modification without materiallydeparting from the spirit of the invention and we accordingly donotlimit ourselves to4 such specific structure except as hereinafterclaimed.

l. In a screw pump,.a barrel having heads at least. one of which isremovable. a shaft rotatably directed through said heads, a linersupport within the barrel and surrounding the shaft, 'a liner sleevesupported by the liner support and4 likewise surrounding the shaft andhaving engagement with the supportcentrally thereof whereby it is heldagainst rotation with relation to the support, the adjacent faces of theend portions of the sleeve and support being spaced to provide packingspaces,. followers engaged in the'ends of the packing spaces, meansadjustable through said heads for shifting the followers and spacedopposed i worms mounted upon the shaft within the sleeves 2. ln a screwpum a barrel having heads at least one of whic Vis removable, a Shaftrotatably directed through said heads, a liner support within the barreland surrounding the shaft, a liner sleeve supported by the liner supportand likewise surrounding the shaft and having engagement with thesupport centrally thereof whereby it is held against rotationwithrelation to the supporti, the adjacent faces of the end portions ofthe sleeve and support being spaced to providepacking spaces, followersengaged in the ends of the packing spaces, means adjustable through saidheads for shifting the followers, spaced opposed worms mounted upon theshaft within the sleeve, the barrel having an inlet and an outlet. theoutlet communicating with the space between the worms, the inletcommunicating with the ends of the sleeve and means supported by thesleeve and surrounding the shaft between the worms preventing rotationof fluid about the shaft at the outlet and directing the fluid to theoutlet.

3. In a screw pump a barrel having heads at least one of which isremovable, a shaft rotatably directed through said heads, al linersupport within the barrel and surrounding the shaft, a liner sleevesupported by the liner support and likewise surrounding the shaft andhaving engagen'ient with the support centrally thereof whereby it isheld against rotation with relation to the support, the adjacent facesof the end portions of the sleeve and support being spaced to providepacking spaces, followers engaged in the ends of the packing spaces,means adjustable through said heads for shifting the followers, spacedopposed worms mounted upon the shaft within the sleeve,

' ythe barrel having an inlet and an outlet, the

outlet communicating with' the space bey tween the worms, the inletcon'miunieating;l with the ends oli-the sleeve, means supported by thesleeve and surrounding the shaft between the worms preventing rotationofi fluid about the shaft at the outlet and directing the fluid to theoutlet comprising a flange having an o ening for the passage of theshaft and a ra ial notch communicating with the outlet.

4. In a screw pump, a barrel having heads at least one of which isremovable, a shaft rotatably directed through said heads, a. linersupport within the barrel and' surrounding the shaft, a liner sleevesupported by the hner support and likewise surround. ing the shaft andhaving engagement with the support centrally thereof whereby it isheldagainst rotation with relation to the support, the adjacent faces of theend ,por-

tions of the sleeve and support being spaced 1 to provide .packingspaces, followers engaged -in the ends of the packing spaces, meansadjustable through said heads for shiftingV the followers and spacedopposed worms mounted upon the shaft within the sleeve, adjacent ends ofsaid worms having engagement with the liner preventing longltudmalmovement thereof.

. Iu a screw pump, a barrel having heads held against rotation withrelation to thesupport, the adjacent faces of the end portionsof thesleeve and support being spaced to provide packing spaces, followersengaged in the ends of the packing' spaces, screws adjustablydrectedthrough said heads and having their inner ends abutted againstthe adjacent followerl and spaced opposeduwormsmounted upn the shaftwit-hin the sleeve.

6. In a screw pump, a barrel having heads at least one of which isremovable, a shaft rotatably directed through said heads, a linersupport within the barrel and sur.- rounding the shaft, a liner sleeve'supported by the liner support and likewise surrounding the shaft, saidsupport and sleeve having coacting polygonal central portions engagingto prevent relative rotation thereof` the ends of the opposedl faces ofthe support and sleeve'being circular and being spaced from one anotherto provide annular packing spaces, follower rings inserted in the endsofthe packing spaces, means adjustable through the heads and engagingthe packing rings and spaced opposed :worms mounted upon the shaftwithin the sleeve.

7 In a screw pump, a barrel having heads at least one of which isremovable, a shaft rotatably,a directed through said heads, a liner@support within the barrel and surrounding the shaft, a liner sleevesupported by the liner support and likewise surrounding the shaft, saidsupport and sleeve-having coacting polygonal central ortions engaga5 ingto prevent relative rotation thereof, the n ends of the opposed facesofthe support and ,sleeve being circular, and'being spaced lfrom onelanother to provide annular packing s aces, follower rings inserted inthe ends o'tl tie packing spaces, means through the heads and engagingthe packingv ringsand spaced opposed worms mounted upon the shaftwithinthe sleeve, the sleeve having a central flange one edge of which isextended into proximity to the shaft, said flange having a radiallydirected notch. y

8. In a screw pump, a barrel having heads at least one of Vwhich isremovable, a shaft rotatably directed through said heads, a

liner support within the barrel and surrounding the shaft, a linersleevesupported by the liner support and likewise. surrounding theshaft, said support and sleeve havingcoacting polygonal central portionsenadjustable gaging tol prevent `relative `rotation thereof,

the ends of the opposed faces of the support and sleeve. being circularland being spaced from one another to provide annular packing spaces,follower ,rings inserted in the ends of the ackng spaces, meansadjustable through t e heads and engaging the packing rings and spacedopposed worms mounted upon the shaft within the sleeve, the sleevehaving a centralflange one. ledge of which is extended into proximity tothe shaft, said flange having a radially directed notch, said wormshaving frustro-conical cores the larger ends of which are opposed ltothe ang'e, the base of the notch aligning with th'e adjacent edge of thecore.

In testimony whereof we affix our signatures. LEE J BLACK.

' ERNEST E. SWOPE.

